Lighting apparatus.



. A. HAWTHGRNE.

LIGHTING APPARATUS.

CATION EILE APPL] Patented Mar. l2, 1918.`

2 SHEETS-SHEET .1.

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,V EEZ@ umbri@ E. A. HAWTHORNE.

LIGHTING APPARAus,

;\PP!.lC/\T1ON FILED IULY 2, lQl.

Patented Mm'. 12,1918.

2 SHEETS-SHEET 2,

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. suit-abi e means tion the shield 21, which is perforated for this purpose, is brought against the shoulder after which it is fastened by any suitable means. Herein the inner end of the plunger 26 is provided with a recess 29, and lhe outer edge of this recess is spun or riveted down to form a flange 30 which firmly holds the shield 2l in fixed position against the shoulder 28. The recess 29 has the further advantage of providing a chamber to .receive a usual spur or tip 3l of the bulb 12 to prevent the same from becoming broken, as might otherwise be the case due to the end of the plunger 26 striking the tip,

The plunger 26 may be guided by any suitable means, but herein I have provided .for this purpose means including a bushing,` 32- encircling the plunger and extending through a perforation 33 in the glazing 16. This bushing may be secured in its place by any appropriate means, such for example a nut 3ft encirclingu and havin fg screw-thread ed eixgagenicnt with the busiing, While the latter is provided with a flange 35 consti-- tilting an abutment. .By turning the nut Bel in the` proper direction, the glazing 16, which is interposed between the nut and the flange, is clamped between them. If desired,

' may provide suitable yielding washers 36 and 37 of appropriate material such as fiber to form a tight joint, and to prevent the bushing .rom turningr in theglazing these washers may be cemented in place if desired when the parts are assembled, but in practice I have found this to be unnecessary.

The bushing 32 may alsol serve as con venieit means for securing the shield 24 in its place, and to that end the latter is centrally perforated in orderthat it may be slipped onto the bushing and brought against the flange 35, so that when assembled. it is interposed between saidfliange and the nner washer 37. .Inthi's way the shield 2a can be clamped/against the washer 37 and hcldrigidly in its proper'positon. Any .may be 4'provided for securing the nut 34' so that the same shall. not become accidentally unscrewed, but herein I have provided for such purpose a set screw threaded into thefnut 34 in a radial direction and bezuingfegainstthe bushing,` 32. The plunger 26 is preferably c lindrical, and may therefore be moved axia ly as well as turned within the bushing 32'v for the pur poseof adjusting'the shield 21. As a means for securing the shield in the desired position `of adjustment, I have herein provided fricton'al clamping means` encircling the plunger 26, said means herein including a -contractible clamping ring or collar 39 and a nut 40 having screw-threaded engagement with said collar. The collar 39 may be rendared contractible in any suitable manner, but herein is provided with a plurality of longitudinal slots 41. As a means f0ruti- 'lizing the nut to contract the ring 39 and bushin'r with coperating inc ined or Wedge ik'e surfaces and 4.5, preferably of truste-conical form. The conical surface 44 is herein formed on. ner end oir the collar 39. By turning the nut 4.0 in one direction, .it tends to produce an axial movement of the collar 39 in an out- Wai-fl direction, wln-neby the cooperating inclined surfaces 44 and contract the split portion of the ring 39 and cause the latter to bind or grip the plunger 26, thus'to hold the latter in the desired position, of adjustment. When, however, the nut is turned in the op posite direction, the collar is loosencdand the plunger may then be moved axially or turned to carry the shield 2l to the desired position, after which the nut 40 is operated to clamp the plunger once more. To facilitate mrning the nut ll() by means of the fingers, its circumferentii-il surface may be knurled, as shown in Figl..

When the shield 21 is adjusted to its extreme forward position, as ill ustrated in Fig.

a flange 46 on the in' 3, it may, and preferably does recede entirely into the shield 24. Under these circu1nstances the latter serves as a means to cut off direct rays from the bulb'l to the glaz ing 16. The shield 25, however, cuts ott' no rays from. the reflector When the shield 521 is moved in a rearward direction from the position shown in Fig. 3, however, it will gradually cut oil? more and more rays' from the reector 13, until it reaches its extreme rearward position. .As a means for preventing the shield 2l. from touching the reflector i3 and thereby possil'iiy injuring the highly polished surface of the hitter, I have herein provided ward movement lei" said shield, such means herein consistinga of the handle to which l have hereinbefore referred as being secured tothe plunger 2li In assembling the lamps it is found that owing to slight variations in dimensions of certain. parts, it-s desirable to provide adjustable means to limit the inward movement of the shield 21. To this end I have shown, the stop .27 in the form of a mit, encircling and haying screwthreaded engagement,l with the plunger 26. .By turning the nut in one direction or the other, the inward limit of movement of the shield Q1 may be determined with great ac'- curacy. When thus adjusted the nut 27 may be secured by any suitable means,-as for ex-V i ample, a locking-screw 47 extending through in the forward end of the a perforation 48 nut 27 and threaded. axially into the plunger .26. By slightly loosening the screw the-nut 27 maybe turned and adjusted and again locked by means of the lcoli-ingscrew.` ,',lo .facilitate the turning of the nut 27, as well aS the backward and 'forward and movements of the plunger 26, the circumferential surface of the nut may be knurled, as illustrated in Fig. 1.

vReferring now to Fig. 5, I have there shown a modification of the means for clampingthe plunger. In this form a bushing 32, encircling the plunger 2G and extending through the glazing 16, islsecureil therein by a nut 34- having screw-threaded engagement. with the bushing, While the lutteipjsoro'- vided with a flange 35 constituting a'if'a nit-1 ment. By turning the nut 34 in 'the proiier" direction., the glazing 16, which is interposed between the nut and the liange, is' clamped between them. In this respect the bushing 32 and its mode of abutment' is similar tothe bushing 32 hereinhefore (lescnihed.v

Here, however, the 'resemhlance ends, for instead of providing a separate contractible collar, as ii the form first described, I have made the bushing 32 itself contractible by providing the bushing with a plurality-- of slots 41. In this form a nut el-O, threaded onto the bushing 32', ,serves as a means for contracting the split portion ofthe Vbushing.

To this end, the :bushing and nut are herein provided with coperating.inclined surfaces 44 and 45', pi'eerahly having a .trustoeconis cal form. By simply turning the nut 4G in the proper direction, the contractible portion of the bushing 232 is caused to conjtruct and clamp the plunger 26, therelfiy to hold the latter in the desired position of adjustment. In other1 respects, this form of my invention is similar to that here-,inhsv fore described-in connection with il to 4 inclusive.

While I have herein shown and described two .forms or embodiments of my invention for illustrative purposes, and have disclosed and discussed in detail the constructions and arrangements incidental totwo speciiic ap plica-tions thereof, it to he under-stoof1 that the invention is limited neither te th diere details or relative arran gement of par ts, nor

to its specific embodiments herein shown but that extensive deviations from the illusu trated forms or embodiments of the invention may be made without departing from 'the-principles thereof.

A Having thus `described two embodimentsof my inventlon, what I claim and desire y by Letters Patent to secure is:

1. ,A lighting apparatus comprising, in combination. a source of light, a rellector associated therewith to project light rays emanatingl from said. source, a glazing through which said rays may be projected, means to intercept some rays emanating from said source, and instrumentalities for adjustably positioning the intercepting Ii'ieans with reference to said light source, the last mentioned means including slidable adjusting means and securing means there- .for comprising `a contrae-cible collar entend# ing through said glazing and means to contract said collar about said adjusting means.

2. A 'lighting apparatus comprising, in

combination, a source of light, a reiector associated therewithto proiect light'.4 rays emanating from said source, a glazing through which said rays may be projected, means. -tc intercept some rays emanating from said source, and instrumentalities for adjustably positioning the intercepting means with reference to said light source,` 'the last mentioned means including slidable adjusting means and securing means therefor 'eomprisin a threaded contractib'le collar extending t rough said glazing and a nut threaded onto said collar to contract the latter about said adjusting means,

3.' A lighting apparatus comprising, in combination, a source oi light, a reiector associated therewith to project light rays emanating from said source, a glazing through which said rays may be progected, means to intercept some' rays emanating from said l through said glazing and provided with anv inclined surface' and means cooperating therewith to contract said collar about said adjusting means.

4. A lighting apparatus comprising, in combination, a. source of light, a reector associated therewith to project light rays emanating from said source., a glazing through which said rays may he projecti'ali7 means to intercept some rays emanating from said source and instrument viss 't adjustahlyT po ng means 'with roten. ice to said iight ticned means including slidf his is, and securing' means tl; -v Y l, collar extending through said glazing d provided with one or more longitudinal slots to Arender the same eontractibl, and means coperati-ng there with te' contract said collar about said adjusting means. v

5. In a. lighting apparatus, the combination with alight souice of a shield 'thcreon and inetriimentalities for adjustahljy posi-' tieni-ng -said shield with reference to said llight source, including an adjustin member, an inner collar through which sai member slides, said collar being provided 4with :one er more slots rendering the "same contractihle, an outer collar enirclin collar, said collars being provi ed with' cooperating inclined surfaces',l and means rela? tively to actua-te said collars to cause the innercollar to contract and `clamp said ad justihg r-rnernlzier therein.

e. f in t; ageing apparatus,- aiq fnf said inner lli."

eing provided,

tion with a light source of :i shield there for, and'instrumentalities for adjustnbly p0 sitioning said shield with reference to said light source, including en adjusting member, :ni'inner coller through which seid mem ber slides, said vcollar being provided with one or more Slots rendering the same contractible, :in outer collar encircling said inner collar, said collars being provlded with eope'mting inclined surfaces, and a nut threaded onto said inner collar andbearing endwise against seid outer collar.

In testimony whereof,l I have signed my name to this specification.

ELLSWORTH A. HAWTHORNE. 

